Calcite on Quartz ''casts'' after Anhydrite (ex Gary Weaver Collection)

Item Description

A rarely seen specimen from the lesser known Keystone Mine near Silverton, Colorado. This piece features small (up to 3 mm), "dogtooth"-shaped pale yellow crystals of Calcite sitting atop a matrix of Quartz which has formed "casts" after preexisting Anhydrite. I've only seen a handful of pieces from this locality, and this is the first Calcite that we've had to offer from this locality. From the collection of Gary Weaver of Prescott, Arizona (1944-2019). Gary was an electrical engineer who worked for many years for Hughes Aircraft in California. After retiring to Prescott, Arizona in the early 2000s, Gary rekindled his childhood love of minerals, amassing a collection of roughly 2000 specimens focusing on localities in which he and his wife had lived or visited (Mexico, Peru and the western / southwestern United States). You can read Gary's obituary here https://www.dcourier.com/news/2019/apr/27/obituary-gary-richard-weaver/